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The demo file contains user defined functions (VBA) Cardinal Spline & Cubic Spline & Monotone Cubic Spline that create interpolation curves that go exactly through all your data points. The advantage of a monotone cubic spline is that it does not 'wobble' at local minima and maxima.

Download demo file (135kB - downloaded 3207 times - Latest version: 2022-01-11, now including both regular function that returns a single Y value, given X and the datapoints, and array function that creates a table with X and Y values, given the number of segments to be created between the datapoints provided.)

If you want to interpolate both X and Y values within a 2-dimensional table, then see Bilinear interpolation (linear plus spline based).

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: A massive 10-1/4 inch worm drive saw designed for cutting 4x material in a single pass. Price : Available at Acme Tools for approximately $439.00 . Skilsaw Buying Guide - Anderson Lumber

: It is the lightest worm drive saw on the market at just 11.5 lbs, significantly reducing fatigue without sacrificing the high torque needed for ripping dimensional lumber. Availability : Currently available at retailers like Lowe's for around $229.00 . Best for Homeowners & DIYers: Skil 5280-01 Go to product viewer dialog for this item. buy skilsaw

: A 40V brushless saw (using two 20V batteries) that mimics the performance of a corded worm drive. : A massive 10-1/4 inch worm drive saw

: This 7-1/4 inch magnesium worm drive saw is a professional-grade workhorse built to last a lifetime. Availability : Currently available at retailers like Lowe's

: It delivers up to 600 cuts per charge and features an electric brake for improved safety. Where to find it : Available at Walmart and Ace Hardware . Best for Heavy Timber: Skilsaw SPT70WM-01 "Sawsquatch"